int main(void){

    int a,b;

	printf("enter two numbers:");

	scanf("%d %d",&a,&b);

	printf("add:%d\n",add(a,b));

	printf("sub:%d\n",sub(a,b));

	printf("mul:%d\n",mul(a,b));

	printf("div:%lf\n",div(a,b));

	return 0;

}

